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Standard VI

Mathematics

Unitary Method

If 2 erasers ...

Question

If 2 erasers cost Rs 4 and 3 pencils cost Rs 9, then how much would 3 erasers and 2 pencils cost?

₹12

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₹10

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₹9

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₹15

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Solution

The correct option is A ₹12
Cost of 2 erasers = ₹ 4
$\Rightarrow$ Cost of 1 eraser = $\frac{4}{2} = ₹ 2$
Also, Cost of 3 pencils = Rs 9
$\Rightarrow$ Cost of 1 pencil = $\frac{9}{3} = ₹ 3$
$∴$
3 erasers and 2 pencils cost : $3 \times 2$ + $2 \times 3$ = 6 + 6 = ₹12

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If 2 erasers cost Rs 4 and 3 pencils cost Rs 9, then how much would 3 erasers and 2 pencils cost?

The correct option is A ₹12Cost of 2 erasers = ₹ 4 ⇒ Cost of 1 eraser = 42=₹ 2 Also, Cost of 3 pencils = Rs 9 ⇒ Cost of 1 pencil = 93=₹ 3 ∴ 3 erasers and 2 pencils cost : 3×2 + 2×3 = 6 + 6 = ₹12

The correct option is A ₹12
Cost of 2 erasers = ₹ 4
$\Rightarrow$ Cost of 1 eraser = $\frac{4}{2} = ₹ 2$
Also, Cost of 3 pencils = Rs 9
$\Rightarrow$ Cost of 1 pencil = $\frac{9}{3} = ₹ 3$
$∴$
3 erasers and 2 pencils cost : $3 \times 2$ + $2 \times 3$ = 6 + 6 = ₹12